Multiplication of dataframes

you should first transform them to matrices using data.matrix() and then 
do a matrix multiplication using %*%.

This will create a matrix, which you can then convert to a data frame, 
if you want, using as.data.frame(). For instance, check the following:

d1 <- data.frame(x = rnorm(10), y = rnorm(10))
d2 <- data.frame(x = rnorm(10), y = rnorm(10))

res <- data.matrix(d1) %*% t(data.matrix(d2))
res
as.data.frame(res)


I hope it helps.

Best,
Dimitris

If I have 2 data frames;
df1:    dim(df1) = (1,10)
df2:    dim(df2) = (2000,10)

Both with column header names, how do I multiply them together please. I.e
create a dateframe dim() = (2000,1)

Many Thanks in advance

Glenn

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Dimitris Rizopoulos
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Department of Biostatistics
Erasmus Medical Center

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